I'm still young and not ready to settle down so send over the bad guys, well ACTUAL bad boys (you're friends would start showing their true colours if the girl pursued a relationship, unless of course they are actual bad boys), when a girl wants a bad boy they want a fling, someone they know they don't have to worry about remembering dates and their birthday and know that this guy won't get clingy. Also bad boy doesn't necessarily mean asshole, I don't consider guys who sleep around bad boys, so much as they lack self control and the ability to keep it in their pants. You have to actually do something BAD not asshole-ish to be considered a bad boy at least in my book. Not to say that there aren't guys who sleep around who I wouldn't consider bad boys (like those inmates for example) but they would have to do something bad.
This is not something I would ever do but some girls like to make them their pet project, they seem to be under they delusion they're the ones who can change them. As you can imagine it doesn't really work out they way these girls hoped it would.